The key to finding the cause and treatment of cancer is the balance between two newly found substances in the body, Dr. Albert Szent-Györgyi, the 1937 nobelist in medicine, has suggested. The substances are promine, which causes sudden cell growth, and retine, a similar chemical that holds back growth…. He predicted in Science, 140: 1391, 1963, that the new theory will “open a wide field for cancer research....” Laboratory observations during the past ten years ... Indicate sudden cell growt...